Mouse wheel, scrolling and zooming

[Thiago Macieira]

On Monday 2. August 2010 11.18.11 Andre Majorel wrote:
> On 2010-08-02 10:31 -0300, Thiago Macieira wrote:
> > On Monday 2. August 2010 04.35.40 Andre Majorel wrote:
> > > What would you use in an application to scroll in two dimensions
> > > and zoom in/out with the mouse wheel ?
> > > 
> > > Inkscape and (recent) Gimp use :
> > > - no modifier: vertical scroll
> > > - shift: horizontal scroll
> > > - ctrl: zoom
> > 
> > KDE uses:
> > 
> > no modifier: vertical scroll if vertical scrollbars are present
> > ctrl: zoom
> > alt: horizontal scroll
> > 
> > If only the horizontal scrollbars are present, then unmodified
> > buttons 4 and 5 cause horizontal scroll too. Buttons 6 and 7
> > always cause horizontal scroll.
> > 
> > The Alt behaviour comes from Qt (since 3.0, in 2002), whereas
> > the Ctrl behaviour is usually added by applications that
> > support zooming.
> 
> Thanks. Do you see a reason to prefer alt over shift or
> vice-versa for horizontal scrolling ?

I don't see a reason. Alt has been used ever since the first version that 
supported horizontal scrolling. There are no hints in the old commit history 
why it was chosen.

> The apps that use shift for horizontal scrolling scroll *left*
> when the wheel goes *up*. Am I the only one to find that
> backward ? Does KDE scroll left or right for wheel up ?

Alt+WheelUp = left
Alt+WheelDown = right

Up = towards lower coordinate numbers
Down = towards higher coordinate numbers

Wheeling down with and without the modifier will take you from Top-Left to 
Bottom-Right.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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